/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineIdentityInterface.h
Login/Authenticate with user credentials. Will call OnLoginComplete() delegate when async task completes
true if login task was started
bool Login ( int32 LocalUserNum, const [FOnlineAccountCredentials](API\Plugins\OnlineSubsystem\Interfaces\FOnlineAccountCredentials) & AccountCredentials )